If I understand you correctly, you already accepted a deferral on 10/25 and that the applicable length of time is one year. I believe the other ticket shouldn't affect your deferral since you technically got it before your deferral. You can read more about deferred findings here: http://www.seattletrafficandspeedingtickets.com/ticket_practice_areas/faq.html With that being said, your chances of having your ticket dismissed or reduced to a non-moving violation are generally much greater if you have experienced traffic attorney fight your ticket. Many offer free consultations and charge a reasonable flat fee. An added upside is that you generally do not need to appear in court.
Every court is different, but the short answer is no. The second ticket cannot violate the terms of the deferred, because the complained of conduct will have already occurred prior to the deferral being entered.